In battlefield first, a strike behind Russian lines

Low-flying helicopters fire on a Russian fuel depot in Belgorod, setting eight tanks holding 3.5 million gallons of fuel ablaze. Russia says the choppers are Ukrainian, but Ukraine's ministry of defense won't take credit for, or even comment on, the attack. Also today, another attempt to get people out of Mariupol. Our coverage begins with correspondent Phil Black in Lviv.

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